Samsung tv repair

[snipersquad100]

Hi I got a Samsung ps43d490-a1w  The tv just blinks the red led when I switch on the power. I cant find a schematic on this set so I am stuck. How do I find out what board is the problem.

[mariush]

Open it up, measure voltages, inspect components (see if there's bloated capacitors), see what happens when you push buttons (does the psu get out of stand-by?)

Check linear regulators on the boards, sometimes they fail...

Some Samsung tvs also have problems with corrupt eeprom chips... can't help you there though.

[tom66]

X-main board 99% of time. Currently nonserviceable (replace board only) due to unknown failure cause.
When replacing X-main also replace Y-main and update TV firmware (bug in firmware kills X-main board.)
X-main responsible for common electrode of plasma display.

[snipersquad100]

ok thanks

[snipersquad100]

is it possible to rule out the power supply

[tom66]

Yes. Unplug X- and Y-main. You should get brief Vs:205V or so, Va:55V or so and also TV audio will work. Note, Vs and Va will shut off after a few seconds if X- and Y-main not connected, this does not indicate a fault.

Actually that's a good point I thought you had click on-click off symptom but you did not mention this. Maybe I jumped ahead.
Try this test (X- and Y-main reconnected): http://www.badcaps.net/forum/showpost.php?p=318461&postcount=2

[snipersquad100]

what should happen when you connect the two pins?